statement 1:
the product of x and y is 7
In the question it is not mentioned whether x& y are integers or fractions
if x and y are integers x=7,y=1.......... xy=7
if x and y are fractions x=7/4,y=4.......xy=7
Insufficient
statement 2:
x an y are integers
The values of x or y aren't mentioned
Insufficient
Combining both the statements we get four possibilities
x=7,y=1
x=1,y=7
x=-1,y=-7
x=-7,y=-1
When both x and y are positive (x-y)^4=(7-1)^4=6^4=1296
When both x and y are negative (x-y)^4=(-1+7)^4=6^4=1296
Hence the ans should be C..Let me know if you have any doubts
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